Calvert Hall College High School (also known as "Calvert Hall" or "CHC") is a Catholic college preparatory high school for boys, located in Towson, Maryland, United States. The school was established in 1845 by the Institute of the Brothers of the Christian Schools as a Catholic college preparatory high school for boys. It is the oldest Christian Brothers school in the United States.

Among its academic offerings is the McMullen Scholars Program, a four-year advanced-level curriculum requiring extra coursework in humanities, rhetoric and logic, and a senior independent project. Additionally, a program for assisting students with learning differences exists (the La Salle program).

At the request of Archbishop Samuel Eccleston, who wished to provide a Catholic school for boys in the Archdiocese of Baltimore, the Brothers of the Christian Schools in Canada provided training for English-speaking candidates to become members of their order.

Once they had taken their vows, the new Brothers, led by Baltimore native Brother Francis McMullen, FSC, returned to the Archdiocese and attended the first Mass on September 15, 1845 with 100 students to commemorate the opening of what would become known as Calvert Hall College High School, the first school founded by the Institute of the Brothers of the Christian Schools in the United States.

Initially, the school was located in the parish hall of the former St. Peter's Pro-Cathedral but a rise in enrollment led to the purchase of property at Cathedral and Mulberry Streets, which was dedicated by Cardinal James Gibbons in 1891.

Calvert Hall moved again in September 1960, under the direction of Brother Gabriel Cannon, FSC, to its current Towson location. Throughout the next five decades, Calvert Hall continued to expand, adding additional buildings which provide space for academics, technology, and extracurricular activities, as well as renovating old spaces to maintain high quality facilities.

Students at Calvert Hall experience a college preparatory curriculum, operating on a cascading six-day schedule. The schedule is fit with individual learning opportunities, during which students can choose to eat lunch, study, or meet with an available teacher. The free periods provide flexibility and allow students to develop effective time management skills. In addition, Calvert Hall uses a team teaching philosophy and a lecture-seminar format to mimic a university lecture system. Lectures are held in lecture halls that are equipped with multimedia presentation capabilities while seminars take place in classrooms centered on student learning.

Students are required to take four years of English, Social Studies, and Religion; three years of Mathematics and a Laboratory Science; and two years of Foreign Language and Physical Education/Health. Freshmen must take a year of Computer Applications while Sophomores are required to take a Fine Art. Electives, which include Introduction to Engineering, Forensic Science, and Personal Finance among others, are offered in all departments. A total of four elective units are a graduation requirement.